How can I validate a P&ID for an R717 pumped-overfeed evaporator valve station for a graduation thesis?
Hi everyone on reddit!,
First of all I am fairly new to industrial refrigeration systems, I am doing a engineering study.
I am working on a graduation thesis in industrial refrigeration. The project is about a standardized evaporator valve station for an ammonia system. The system is based on R717 pumped-overfeed evaporators with hot-gas defrost.
The valve station is divided into four functional sections:
- Liquid Feed
- Wet Return
- Hot Gas Defrost
- Defrost Drain
The goal is not to certify a real installation, but to prove in my thesis that the proposed P&ID is functionally plausible and can operate in different modes, such as:
- normal cooling
- part-load operation
- pump-down / isolation before defrost
- hot-gas defrost
- defrost drain / pressure equalisation
- return to cooling
I am struggling with how to prove this properly to my tutor. I can make calculations for mass flow, pressure drop and Kv values, and I can compare component sizing with Danfoss Coolselector². I can also make an operating-mode matrix that shows which valves are open or closed in each mode.
However, I do not have a real installation available for live testing, and even then there are no inline flow meters in the system.
My question is:
What would be a technically acceptable way to validate this kind of P&ID for a graduation thesis?
I am especially interested in how engineers normally prove that a valve arrangement is functionally correct before it is built or commissioned.
Any help would be greatly appriciated!